Demodulator Filter Feedback Gain for PVT-Stable Data Links
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Solution Overview
Problem
Existing data communication systems in electrical systems face challenges in maintaining consistent frequency response and power efficiency due to process, voltage, and temperature (PVT) variations, leading to distortion in signal transmission between IC chips and devices.
Innovation Solution
A communication system that includes a demodulator with a filter and a gain adjusting circuit, where the filter's gain is controlled by a set of control signals based on the voltage of filtered signals, automatically adjusting the frequency response to compensate for PVT variations and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fixed-gain filters are used in data communication systems, then the circuit structure remains simple, but the frequency response becomes inconsistent under PVT variations causing signal distortion
Solution Approach 1:
The patent implements a dynamic gain adjustment mechanism where the filter's gain is automatically adjusted based on detected signal characteristics. The system transitions from a static fixed-gain filter to a dynamic adaptive filter that modifies its parameters in real-time to compensate for PVT variations, thereby maintaining consistent frequency response without requiring complex external calibration circuits
Solution Approach 2:
The patent employs a feedback mechanism where the output of the filter is detected and used to control the gain of the filter itself. The detector monitors the filtered signal and provides feedback to the gain control circuit, which adjusts the filter gain to maintain optimal frequency response. This closed-loop feedback system automatically compensates for PVT variations without increasing overall system complexity
2Reliability
If high power is consumed to maintain signal integrity under PVT variations, then frequency response consistency is improved, but power efficiency deteriorates
Solution Approach 1:
The patent implements a self-adjusting system where the filter automatically compensates for PVT variations using a portion of its own output signal. The detector monitors the filtered signal and the gain control circuit adjusts parameters based on this self-diagnosis, eliminating the need for external high-power calibration circuits or additional power-consuming compensation mechanisms
Solution Approach 2:
The patent dynamically changes the gain parameter of the filter based on detected signal characteristics and PVT conditions. By adjusting the gain parameter in response to varying operating conditions, the system maintains signal integrity and frequency response consistency without requiring constant high power consumption, achieving adaptive power efficiency
3Reliability
If the filter gain is manually adjusted for each PVT condition, then frequency response consistency is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent implements a self-adjusting system where the filter automatically compensates for PVT variations using a portion of its own output signal. The detector monitors the filtered signal and the gain control circuit adjusts parameters based on this self-diagnosis, eliminating the need for external high-power calibration circuits or additional power-consuming compensation mechanisms
Solution Approach 2:
The patent employs a feedback mechanism where the output of the filter is detected and used to control the gain of the filter itself. The detector monitors the filtered signal and provides feedback to the gain control circuit, which adjusts the filter gain to maintain optimal frequency response. This closed-loop feedback system automatically compensates for PVT variations without increasing overall system complexity
Data Source
AI summary
A communication system includes a modulator configured to generate a modulated signal responsive to at least a data signal, and a demodulator configured to demodulate the modulated signal responsive to a first carrier signal. The demodulator includes a filter configured to generate a filtered first signal based on a first signal, and a gain adjusting circuit coupled to the filter. The first signal is based on the first carrier signal and modulated signal. The filter has a gain controlled by a set of control signals. The gain adjusting circuit is configured to adjust the gain of the filter, and to generate the set of control signals based on a voltage of the filtered first signal and a voltage of the first signal. The gain adjusting circuit includes a first peak detector coupled to the filter, and configured to detect a peak value of the voltage of the filtered first signal.